Elevate Your Category Knowledge

Fraser-Johnston® Commercial Packaged & Split DX Education is the perfect destination for all your commercial needs. Our comprehensive collection of resources cover Commercial Packaged & Split DX Applications, Technology & Warranties, and Sustainability - all designed to help you stay informed and up- to-date. With our expert advice and thorough research, you can trust us to provide the best possible guidance to obtain Professional Development Hours (PDH) credits at no cost to you.

Commercial Packaged & Split DX Application

We have the features and options providing greater flexibility to meet the needs across a variety of applications, geographies, and building construction constraints.

Benefits of UV-C Lights in Fraser-Johnston® Commercial Equipment

UV-C lights are a proven technology that can help to irradiate a surface or airstream. Airstream disinfection requires a significantly greater level of intensity than typical surface decontamination.

The Importance of IAQ

Commercial buildings should receive proper amounts of outside air to reduce the concentration of indoor air containments. Good industry practice recommends the energy savings use of “free cool” during mild weather times. The use of fresh air inherently allows for 100% replacement of the zone air for each ACH cycle.

Preparing for DOE 2023

Prepare for the U.S. Department of Energy's 2023 energy efficiency regulations by learning more through downloading the 2023 Regulatory Requirements Guidebook and familiarizing yourself with new energy efficiency metrics.

Heating Options for Application Flexibility on Select Rooftops

Relia™ Choice rooftop units are the most economical comfort cooling option in the 15-27.5 ton range. These rooftop units provide 23% greater part-load efficiency than our legacy comparable, standard efficiency units.

Humidity Control

Indoor Environmental Quality (IEQ) is driven by many factors including filtration, CO2 levels, Outdoor air intake, as well as the humidity within the space. Maintaining humidity within an HVAC system between 30-60% relative humidity is a balancing act that must consider system type, application and sequence.

Fraser-Johnston® Relia™ Core Rooftop Replacement-The Right Fit

Approximately 70% of the <15T Rooftop Unit (RTU) market is the replacement of units that have either reached the end of their useful life or, due to changes in the conditioned space, need to be changed to better meet the needs of the application.

To (Hot Gas) Bypass or Not (Hot Gas) Bypass

This document will help you talk with your customers about this option and help them understand why we have not included hot gas bypass as an option with our Relia™ Choice and Relia™ Select products. 

Help Meet IEQ Requirements with Modulating Gas Heat

Air conditioning within the North American market is dominated by the packaged rooftop unit space. In cold weather climates, these packaged rooftop units most commonly use gas heaters to warm the air going down the ductwork and into the space. How these gas heaters are controlled can be critical to ensure proper Indoor Environmental Quality (IEQ).

Airflow Options for Rooftop Units: CV, CRSZ Control, VAV, SZVAV IntelliSpeed

Our white paper on airflow options provides information on various configurations such as CV, CRSZ Control, VAV, SZVAV IntelliSpeed, and DFC which offer advantages like improved efficiency, humidity control, and energy savings for many applications.

Replace Old Voyager Units with Fraser-Johnston® Relia™ Select Rooftops

Replace old Voyager III units with the high-efficiency Fraser-Johnston® Relia™ Select Commercial Rooftop Unit. Relia™ Select rooftops deliver comfort with competitive efficiency, hassle- free retrofit applications, customizable features, and class-leading warranties. On top of the matching footprint, Relia™ Select products will give the customer the ability to save money on their monthly utility bills.

Fraser-Johnston® Relia™ Core for Direct Replacement of 3-12.5 Ton Commercial Rooftop Units-The Right Fit

With the increased cost and complexity of using a curb adapter to fit an existing base of a rooftop unit, Fraser-Johnston® Relia™ Core rooftops resolve this issue as the “go-to” replacement solution for 3-12.5 ton replacement jobs.

Fraser-Johnston® Relia™ Choice Rooftops-New School Meets Old School

Relia™ Choice Rooftop Units meet the needs of the replacement and new construction market better than any industry product. The product surpasses the Department of Energy 2018 guidelines by up to 25% and exceeds the DOE 2023 part-load standards by almost 10%. Relia™ Choice rooftops reach amazingly high efficiencies without the complexity of variable speed compressors.

Replacing Multiple Competitors with Fraser-Johnston® Relia™ Choice

Using the Fraser-Johnston® Relia™ Choice for Direct Replacement of 15 to 27.5 Ton Commercial Rooftop Units allows for the direct replacement of both the Carrier Weather series product and the Trane Voyager 2 product. Care has to be taken to ensure proper seating of the unit on the roof curb to align the supply and return air openings.


Sustainability is an integral part of our vision and values. Buildings undergo several phases over their lifetime, including design, construction, operation, and retrofits. In each stage, there are opportunities to improve energy efficiency and reduce emissions. We are committed to keeping our customers informed of ways to achieve greater efficiency.

Preparing for DOE 2023

Prepare for the U.S. Department of Energy's 2023 energy efficiency regulations by learning more through downloading the 2023 Regulatory Requirements Guidebook and familiarizing yourself with new energy efficiency metrics.

Reducing HVAC GHG Emissions: Electrification & Decarbonization-Replay the Webinar

Reducing HVAC Greenhouse Gas Emissions: Electrification & Decarbonization. Johnson Controls is excited to sponsor a free webinar on reducing HVac Greenhouse gas emissions hosted by The NEWS. Mark Lessans, Director of Regulatory and Environmental Affairs from Johnson Controls, discusses the implications of electrification and decarbonization in the HV AC industry.

PDH Credit Course

Professional Development Hour (PDH) credits include hours for instruction and presentation within the engineering industry. Most professionally licensed engineers need to maintain a certain number of PDH credits per year in order to maintain an active license.

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